Concrete-wall mold.



PATENTED APR. 14, 1908.

CONCRETE ALL MOLD.

UNITED s'rArns PATIENT OFFICE.

JOHN HURSFIEL'D, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO FRANK M.SILRESEN- RENTER, OF CHICAGO, ILLINOIS CONCRETE-WALL MOLD.

Application filed August 22, 1907.

Specification of Letters Patent.

- Tool whom it may concern:

, fication.

This invention relates to an improvement in the type of molds forconcrete walls which constitute the subject matter of my formerapplication for Letters PatentSerial Numb er 381,407, fi1ed June 29th,1907; and has for its object to provide a simple and eflicientstructural formation and combination of parts in tie plates adapted tosecure the intersecting corners of the mold planks together in asubstantial and readily detachable manner, all as will hereinafter morefully appear.

In the accompanying 1, is a detail plan view of a mold for concretewalls, embodying the present invention. Fig. 2, is a detail ver-' ticalsection on line :c.-:c Fig. 1. Figs. 3 and 4, are plan views of theblanks from which the tie plates are formed.

Similar numerals of reference indicate like parts in the difi'erentviews. Referring to the drawings, 1 and 2 are intersecting ends of pairsof mold planks arranged in separated relation to form the vertical wallsof the mold cavity.

3 are the tie plates by which the mold planks are secured in propervertical alinement. Such tie plates are formed of plate metal, so thatwhen in place they will occupy but little vertical space betweenadjacent edges ofthe mold planks, and as usual in the present type ofwall molds. In thepresent construction, said tie plates are formed atdrawings :-Figure their inner ends with right'angle flanges I and 5extending in opposite directions away a corner portion of.

from the main body of the plate and adapted to form stops for theadjacent inner corners of the mold planks to hold the same againstinward. lateral displacement. At their outer ends, said plates areformedwith two or more elongated slots 6 for the passage of the tapering keysor wedges 7, which are driven into saidslots and have bearing againstthe out-er faces of the mold planks 1, and are adapted to force andclamp said mold planks against the flanges 4 and'5 as said keysor wedgesare driven into place.

The novelty of the present improvement comprises two series of the abovedescribed flanges l and 5 on each tie plate and ar that one series willbe individual to one pair of mold planks, andthe other series individualto the other and intersecting pair of mold planks; and in connectionwith the above responding angular arrangement of the elongated slots 6in the tie plate, so asto attain a corresponding individualrelation ofsaid slots and their tapering k s or wedges to the respective pairs ofmold planks.

Having tlius i lly' described my said invention, what I claim as newvanddesire to secure by Letters Patent, is:

A tie late for mold planks, comprising a main plate, having pairs ofright angle llanges arranged in' angular relation atone sideof said mainplate, and a pair of elongated slots in like angular relation. at theother side of said main plate, and tapering key?1 engaging said slots,substantially as set iort'. Signed. at Chicago, Illinois, this 19th dayof August 1907.

JOHN HORSFIELD.

Witnesses ROBERT BURNS, IIENR] Mon.

ranged in angular relation to each other, 'sodescribed arrangement therewill be a cor-

